Compactly implemented

Vibration monitoring of rotating machinery does not have to be expensive. PMM-305 is ready for connection to dynamic sensors or raw signal outputs from third-party systems.

MC-Monitoring, the Swiss specialist for air gap and fibre optic acceleration sensors, has developed and launched the new PMM-305 monitoring system for dynamic vibration signals. The system is distributed in Germany by AVIBIA as the exclusive partner company of MC-Monitoring.

The PMM-305 unit can record and process any dynamic sensor signals due to its large input measuring range of +/- 24 V AC. PMM-305 does not include complex and expensive signal conditioning for special sensor types, but is limited to its core task, signal processing and monitoring.

• Stand-alone 4-channel + 1-channel condition monitoring and supervision unit with on-board buffer memory for raw signals
• Predefined acquisition modes for relative or absolute bearing vibration and air gap measurement
• +/-24V differential inputs for direct connection of sensors
• individual setting of alarm and danger limit values per channel
• Modbus TCP/RTU interface
• Connection bus between modules to reduce wiring effort
• suitable as a bridge to connect third-party monitoring devices to the CMS-500 Orca software

The output signals of shaft vibration sensors and many other sensor types are connected directly to PMM-305 without a transducer. Low-cost preamplifiers are used to connect accelerometers. Direct connection of seismic vibration velocity sensors and air gap sensors is possible without an additional measuring amplifier.

Due to the focused puristic layout, the system is not over-engineered, but offers high performance at an optimal cost/benefit ratio. The PMM-305 unit captures dynamic sensor signals (vibration or pressure) or raw signal outputs (buffered outputs) of existing vibration monitoring systems. The sampling rate of up to 50kHz/channel offers a high dynamic range with a useful signal bandwidth of DC to 20kHz in the spectrum.

Vibration signals are pre-processed internally to characteristic values (peak, peak-peak, vector maximum value and RMS value). At the same time, event-controlled, high-resolution raw data can be buffered in the internal data memory for offline detailed analysis.

Individual alarm and danger limit values - depending on the system status (operation type) - two OTP modes (via digital input) and up to 16 OTP modes (via Modbus) can be configured for each channel. In addition, PMM-305 can transmit the data to a SCADA software or PLC with its two slave Modbus interfaces (TCP and RTU).

The system is supplied with the real-time software PMx-Manager for visualising and configuring the data in real time via Ethernet using the TCP/IP protocol. In addition to individual configuration, suitable default settings can be selected from seven predefined configurations for specific applications.

The LAN connection is used in parallel for communication with the CMS-500 Orca diagnostic software for long-term trending and machine status analysis. By default, up to 32 PMM-305 units can be connected to the same CMS-500 Orca server. The Orca software offers diagnosticians very comprehensive functions and, in addition to spectrum analysis, also polar and orbital evaluations and raw signal analysis.